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drm/radeon/dpm: fix calculations in si_calculate_leakage_for_v_and_t_formula

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Need to make some slight adjustments for the fixed point math to
work properly.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher
2013-07-30 16:56:52 -04:00
parent a838834b2f
commit 31f731af51
1 changed files with 5 additions and 3 deletions
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8
drivers/gpu/drm/radeon/si_dpm.c
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@@ -1765,8 +1765,9 @@ static void si_calculate_leakage_for_v_and_t_formula(const struct ni_leakage_coe
{ {
s64 kt, kv, leakage_w, i_leakage, vddc; s64 kt, kv, leakage_w, i_leakage, vddc;
s64 temperature, t_slope, t_intercept, av, bv, t_ref; s64 temperature, t_slope, t_intercept, av, bv, t_ref;
s64 tmp;
i_leakage = drm_int2fixp(ileakage / 100); i_leakage = drm_int2fixp(ileakage) / 100;
vddc = div64_s64(drm_int2fixp(v), 1000); vddc = div64_s64(drm_int2fixp(v), 1000);
temperature = div64_s64(drm_int2fixp(t), 1000); temperature = div64_s64(drm_int2fixp(t), 1000);
@@ -1776,8 +1777,9 @@ static void si_calculate_leakage_for_v_and_t_formula(const struct ni_leakage_coe
bv = div64_s64(drm_int2fixp(coeff->bv), 100000000); bv = div64_s64(drm_int2fixp(coeff->bv), 100000000);
t_ref = drm_int2fixp(coeff->t_ref); t_ref = drm_int2fixp(coeff->t_ref);
kt = drm_fixp_div(drm_fixp_exp(drm_fixp_mul(drm_fixp_mul(t_slope, vddc) + t_intercept, temperature)), tmp = drm_fixp_mul(t_slope, vddc) + t_intercept;
drm_fixp_exp(drm_fixp_mul(drm_fixp_mul(t_slope, vddc) + t_intercept, t_ref))); kt = drm_fixp_exp(drm_fixp_mul(tmp, temperature));
kt = drm_fixp_div(kt, drm_fixp_exp(drm_fixp_mul(tmp, t_ref)));
kv = drm_fixp_mul(av, drm_fixp_exp(drm_fixp_mul(bv, vddc))); kv = drm_fixp_mul(av, drm_fixp_exp(drm_fixp_mul(bv, vddc)));
leakage_w = drm_fixp_mul(drm_fixp_mul(drm_fixp_mul(i_leakage, kt), kv), vddc); leakage_w = drm_fixp_mul(drm_fixp_mul(drm_fixp_mul(i_leakage, kt), kv), vddc);